Half of the sightings thought that Lieutenant Dunbar and Standing Fist would be sisters who were lost as children, but not since. Whether it is a woman who grew up in an Indian community, or a man who later went from hostility to liking and integration, in fact, in the end, they could not adapt to the life of the Indians. After experiencing "civilization", it will be difficult to return to "uncivilized", even if only for a short period of time. The last two people were forced to leave the Sioux tribe in order to protect the Sioux tribe, and the very idea of protecting it is "civilized" in itself, something of modern civilization. The Sioux are more adherent to principles, or tribal beliefs, and would rather die than give in.
From this, I think that the continuation of civilization always comes at the price of giving up some principles and beliefs.
PS: There is an Indian in the movie "The Banner of the Fathers". Even if he became a national hero, he was still insulted by white Americans. Some bars explicitly refused Indians to enter.
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